/**
*      author: Y_Yao
*      created: 2025-04-04 10:30:32
**/

#include<bits/stdc++.h>

#define int LL
using namespace std;
using LL = long long;
const LL LLINF = 9e18;
const int INF = 0x3f3f3f3f;
string s;
int cnt1,cnt2;

void solve()
{
    cin >> s;
    for(int i = 0;i < s.size();i++)
    {
        if(s[i] >= 'a' && s[i] <= 'z')
        {
            cnt1++;
        }
        else cnt2++;
    }
    if(cnt1 > cnt2)
    {
        for(int i = 0;i < s.size();i++)
        {
            if(s[i] >= 'A' && s[i] <= 'Z')
            {
                s[i] += 32;
            }
        }
    }
    else
    {
        for(int i = 0;i < s.size();i++)
        {
            if(s[i] >= 'a' && s[i] <= 'z')
            {
                s[i] -= 32;
            }
        }
    }
    cout << s << endl;
}

signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t = 1;
    // cin >> t;
    while(t--)
    {
        solve();
    }
    return 0;
}